Contents Chapter 2: Boundary Condition Modeling | 2.2. Available Boundary Conditions | Print page 2.2.2. Solid Boundaries A solid boundary is an external surface of the solid domain and supports the following boundary conditions: Wall - Impenetrable boundary to fluid flow. Symmetry Plane - A plane of both geometric and flow symmetry. « 2.2.1. Fluid Boundaries 2.3. Using Boundary Conditions »